Combined tire gauge and indicator



May s, 1928. 1,668,753

I. J. BAKER COMBINED TIRE GAUGE ANDINDICATOR Filed June 50, 1923 Patented May 8, 1928.

UNITED STAT IBVINMJ'. BAKER, or Larry, onro.

comnmnn TIRE GAUGE. AND rivmon'ron.

Application filed June 30, 1923. Serial No. 648,737.

This invention relates to a combined tire gauge andindicator.

The object of the inventionis toprovide a device of this character for use in con 5 nection with the inflation of pneumatic tires and the like constructed so as to beset at a predetermined pressure so that whenpressure in the tire reaches that point the air. will escape and soundyan alarm,.andwhich" also may be used as a tester or indicator to show the pressure already in the tire.

With the foregoingand other objects in view which will-ap earas the description proceeds, the invention resides-in the combinationj and arrangement of parts and in the details" of. construction hereinafter; de-

scribed and' claimed, it being understood that changes inv the precise embodiment of the invention hereindisclosed, may be made within the scopeof what is claimed without departing from the spiritof-the invention. In the accompanying drawings i I Figure 1 representsa side elevation ofa gauge constructed'in accordance with this inventlon,

Fig. Zi's a longitudinal sect on thereof.

Fig. 3 is an enlarged transverse section taken; on the line 3u3 of Fig. 2; and

ing the modified form of-headfor connection with the tire valve; r

In the embodimentillustrated, the combination. gauge and indicator constituting this invention] includes a tubular body 1 having a reduced threaded extension 2- adapted for connection with the source of air supplied. under pressure-such as an air line or a pum A. removable cap 3 is inserted in the re uced end 2 and has a comparatively no small opening 4, which cap is designed to be used when the deviceis used with an airline to prevent flooding of the gauge, said cap to be. removed whenthe gaugeis used in connection with a pump. The body 1 is pro}, vided at the other end thereof with an en- 'largedhead 5 having a removable screw'cap (Sand a packin between it and said head. This cap and packing have registering enlarged aperd 7 of rubber locatedtherein tures as 8 into which projects a stud 9 carbody 1 and is constructed to permit airto enter through said body from'the outerend thereof'andto prevent it from passing out of the body.

A tubular shank or stem 17 extends'laterally from one side of the body 1 and" merges into alarge hollow head 18 which has threaded engagement with a tubular cas-- mg or shell 30 Arranged within the shell 30 is a longitudinally expansible-and contractible casing 20 *surrounded by a closely coiled s ring 21 andequipped atits inner end witi a reduced tubular extension 19 which/is threaded into the shank 17, the flexible and inflatablemember 20 withthe coiled wire wound there around is inserted" in the head 18 as is shown clearly in Fig.2. A spring closed valve 22is located in the outer end of the member 20, which valve 75 has a pin 23 carried thereby and adapted.

when moved inwardly to. open said valve and;

r p i the inner face o fsh'ell 30; said shell 26 be Fig. 4 is a detail longitudinal view showing normally and-freely slidable back and forth in shell 30. A friction device or drag ably holdsaid shells. in adjusted position relatively to" each other for a purpose to be describedr This drag as shown comprises a wire 35encircling shell26 and" having an outwardly bowed arm. 36 arranged longitudinally between the shells and contactin with shell 30 therebyyieldablyholding .sai shells in adjusted position. The shell 30 has a circumferentially' extending slot 28 for a purposepresently to be described.

Aknurled collar 29 encircles the slotted end of shell'30 and is provided on itsinner face with a cam 31 which" cooperateswithh roller 32 mountedin the slot 28 of theshell' 30 so that when the knurled collar 29 is rotated-the action. of the ,cam 31 will! be to force the roller 32 into locking enga ement withtheshellQG and thus 10a; sandman-.- adjusted position It willthus be seenthat the locking means above described is oonccaled and protected and all danger ofsand or grit getting into the gauge is prevented.

The shell 26 is provided on its outer'face with indicia shown at 33 to indicate the pressure in the tire; a

When it is desired to test a tire to determine the pressure of air therein the head 5 of the gauge is placed over the tire valve the collar 29 having first been turned to disconnect shell 26 from shell 30 so that when the stud 9 bears against and opens the tire valve the air will rush out from the tire into the flexible expansible member 20 and force said member outwardly carrying shell 26 so that a glance at said shell will show the air pressure in the tire. The shells 26 and 30 are held in this position by the friction member 35 so that the gauge may be removed from the tire for reading or other purposes without changing the relation of the shells.

Vvhen it is desired to inflate a tire the slidable shell 26 is positioned to indicate the desired amount of pressure to be inserted and is locked in this position by turning the collar 29, the cam face 01' which engaging roller 32 looks casing 26 relative to casing 30. The head 5 is then placed over the tire valve in the manner above set forth and an air line inserted in the socket of the cap 3 and air under pressure will pass in through the opening 4 through the body 1 into the tire and when the desired pressure has been obtained the air backing out through the casing 20 will expand said casing sufficiently to open valve 22 and permit the air to escape through the aperture 24. which will cause a whistling sound and attract the attention of the operator to the fact that the tire has sufficient air entered into it. This escape of the air not only sounds the alarm but prevents excessive pressure obtaining in the tire.

Mounted on the outer end of the member 20. is a collar 37 and abutting against this collar is a head 38 carried by a tube 39 which opens through said head and is closed at its other end b a screw plug 40 which forms an adjustab e seat or abutment for a coiled spring 41 which holds valve 22 normally seated to close the opening in head 38. Head 38 is externally threaded to receive a. threaded sleeve 42 which also has threaded engagement with spring 21 whereby the parts are connected and held in operative position. A. gasket 44 is located between head 38 and collar 37 to form a fluid tight connection at this point. The tube 39 has openings as 45 formed adjacent the head 38 in longitudinal alinement with the valve and impinged against the end thereof.

When the compressed air is to be supphed by means of a pump the cap 3 is removed and the pump nipple is connected direct with the extension 2 in the well known manner.

In Fig. 4 a slightly modified form of head 5 is shown having a removable ca 6 together with units 13 and 14 arrange therein and held in place by a. coiled spring 15 which encircles a reduced extension 16 7 form of an annular member encirc ing said movable member and having an outwardly bowed arm extending longitudinally between said members to frictionallyhold said movable member in adjusted position.

2. Adevice of the class described comprising fixed and movable telescopically engaged shells, compressed air supply means, a longitudinally expansible and contractible casing mounted in said shells and communicating with said air supply means, said casing having an outlet, a tube mounted in said casing around said outlet and closed at its inner end, a valve in the outer end of said casing for closing said outlet, a spring to hold the valve normally closed, said tube havin of adjacent said valve to permit air to enter in a plane at right ang es to the path of movement of the valve and to pass out through the outlet on the opening of the valve when a predetermined ressure is reached thereby preventing. the air pressure from interfering with the operation of the valve.

3. A device of the class described comprising fixed and movable telescopically Vengaged shells, a longitudinally expansible and contractible casing mounted on said shells, air supply means communicating with said casing, said casing having an outlet, a tube mounted in said casing around said outlet and provided with an adjustable closure at its inner end, a valve in its outer end for closing said outlet, a spring to hold the valve normally closed and mounted between the valve and saidadjustable closure, said tube having air inlet openings in the sides thereof adjacent said valve to provide an air inlet opening in the side there-' for the admission of the compressed air predetermined pressure is reached in the from the casing in a nlane at night angles casing. to the. plan of movement in the valve, the In testimony that I claim the foregoing air so admitted passing out through the outas my own, I have hereto aflixed my signa- 5 let on the opening of the valve, and coopture.

erating means carried by said valve and the outer shell for opening the valve when a. IRVIN J. BAKER. 

